:root {
  --bg: #08101d;
  --bg-strong: #0d1830;
  --panel: rgba(16, 23, 43, 0.92);
  --panel-2: rgba(19, 29, 57, 0.94);
  --ink: #f7f2e9;
  --muted: #b7c0d6;
  --gold: #f7b84b;
  --cyan: #61d2ff;
  --red: #ff5b57;
  --line: rgba(255, 255, 255, 0.11);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.34);
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 12% 10%, rgba(255, 91, 87, 0.15), transparent 18%),
    radial-gradient(circle at 85% 12%, rgba(97, 210, 255, 0.16), transparent 20%),
    radial-gradient(circle at 68% 84%, rgba(247, 184, 75, 0.12), transparent 22%),
    linear-gradient(135deg, #08101d, #101b36 50%, #180e23);
}

.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.12;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 100% 3px, 3px 100%;
  mix-blend-mode: soft-light;
}

.shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 22px 18px;
  border-right: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(10, 16, 32, 0.98), rgba(12, 18, 34, 0.9)),
    rgba(10, 16, 32, 0.96);
  backdrop-filter: blur(16px);
  overflow: auto;
}

.brand,
.search-wrap,
.manual-nav,
.sidebar-footer,
.hero-card,
.card,
.chapter-footer {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.brand,
.search-wrap,
.manual-nav,
.sidebar-footer { border-radius: 24px; }
.brand { padding: 22px; }
.search-wrap,
.sidebar-footer { padding: 16px; margin-top: 14px; }
.manual-nav { margin-top: 14px; padding: 10px; display: grid; gap: 8px; }

.eyebrow {
  margin: 0 0 10px;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

h1, h2, h3 {
  margin: 0 0 12px;
  font-family: "Space Grotesk", "IBM Plex Sans", sans-serif;
}

h1 { font-size: clamp(1.9rem, 4vw, 2.6rem); text-transform: uppercase; }
h2 { font-size: clamp(1.5rem, 3vw, 2.4rem); }
h3 { font-size: 1.05rem; }

.lede,
.fine-print,
.card p,
.card li { color: var(--muted); }

.search-wrap span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

input,
select,
button,
textarea {
  font: inherit;
}

input,
select,
textarea {
  width: 100%;
  margin-top: 8px;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(6, 12, 26, 0.78);
  color: var(--ink);
}

.nav-link {
  width: 100%;
  text-align: left;
  border: 0;
  border-radius: 16px;
  padding: 12px 14px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.nav-link:hover,
.nav-link.active {
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(97,210,255,0.18), rgba(247,184,75,0.12)),
    rgba(255,255,255,0.05);
}

.nav-link.hidden {
  display: none;
}

.sidebar-footer {
  display: grid;
  gap: 10px;
}

.button {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  text-decoration: none;
  cursor: pointer;
}

.primary {
  background: linear-gradient(135deg, var(--gold), #ffd37a);
  color: #08101d;
}

.secondary {
  background: linear-gradient(135deg, rgba(97,210,255,0.95), rgba(103,239,255,0.82));
  color: #08101d;
}

.ghost {
  background: rgba(255,255,255,0.08);
  color: var(--ink);
  border: 1px solid rgba(255,255,255,0.1);
}

.main {
  padding: 22px;
  display: grid;
  gap: 18px;
  align-content: start;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.topbar-actions,
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-actions.compact { margin-top: 16px; }

.nav-toggle { display: none; }

.hero-card {
  border-radius: 32px;
  padding: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(260px, 0.8fr);
  gap: 16px;
  background:
    radial-gradient(circle at top left, rgba(255,91,87,0.17), transparent 24%),
    radial-gradient(circle at top right, rgba(97,210,255,0.15), transparent 24%),
    var(--panel-2);
}

.status-card {
  border-radius: 24px;
  padding: 20px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(10, 16, 32, 0.58);
}

.reader {
  min-height: 620px;
}

.chapter {
  display: none;
}

.chapter.active {
  display: block;
}

.chapter-head {
  margin-bottom: 14px;
}

.chapter-grid {
  display: grid;
  gap: 16px;
}

.two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  border-radius: 24px;
  padding: 22px;
}

.form-grid,
.shortcut-grid {
  display: grid;
  gap: 14px;
}

.form-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.span-2 { grid-column: span 2; }

.shortcut-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.plan-output {
  margin-top: 16px;
  display: grid;
  gap: 14px;
}

.plan-step {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 20px;
  padding: 18px;
}

pre {
  margin: 0;
  padding: 16px;
  border-radius: 18px;
  overflow: auto;
  background: rgba(6, 12, 26, 0.72);
  border: 1px solid rgba(255,255,255,0.08);
}

code {
  color: #d7f7ff;
  font-family: "IBM Plex Mono", "SFMono-Regular", monospace;
}

.chapter-footer {
  border-radius: 24px;
  padding: 14px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

@media (max-width: 980px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(86vw, 340px);
    transform: translateX(-105%);
    transition: transform 180ms ease;
    z-index: 4;
  }

  body.nav-open .sidebar {
    transform: translateX(0);
  }

  .main {
    padding: 14px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .hero-card,
  .two-up,
  .form-grid,
  .shortcut-grid {
    grid-template-columns: 1fr;
  }

  .span-2 {
    grid-column: auto;
  }
}